Phase and amplitude perturbations on VLF signals received in the sea
Abstract
An experimental investigation into the stability of VLF signals from the GBR (16 kHz) transmitter at Rugby, England when received in the sea is described. The effect of a rough sea surface on these signals is shown. The measured phase and amplitude perturbations on the signals are very small when received above the sea surface or in the sea under calm conditions, but as the sea surface roughness increases the perturbations on the signals received in the sea increase significantly. The results are explained by a simple model which takes into account the variations in sea path length for the VLF signals caused by sea surface waves passing over the receiving aerial.
- Publication:
-
In AGARD Medium
- Pub Date:
- February 1982
- Bibcode:
- 1982mlvl.agarR....R
- Keywords:
-
- Air Water Interactions;
- Pulse Amplitude;
- Radio Waves;
- Signal Stabilization;
- Very Low Frequencies;
- Wave Propagation;
- Ocean Surface;
- Probability Distribution Functions;
- Sea Roughness;
- Signal Distortion;
- Underwater Communication;
- Communications and Radar